Footage detailing the heavy-handed arrest of an Azerbaijani native suspected of killing a Russian man in Moscow has escalated mounting ethnic tensions between the two nations.

Russian police detained Orkhan Zeynalov on October 15 on suspicion of fatally stabbing a 25-year-old ethnic Russian man, Yegor Shcherbakov, in front of the victim's girlfriend last week in a southern suburb of Moscow.

The killing has sparked violent riots against migrant workers in the Biryulyovo suburb during which hundreds of protesters were detained.

Soon after Zeynalov's arrest, several videos showing police beating and parading the suspect were aired on Russian television, sparking condemnation in Azerbaijan over the Hollywood-style arrest.

An Azerbaijani citizen was found dead on October 16 from an apparent stabbing in Moscow's eastern Izmailovo district. It was the second killing of a non-Russian in as many days. One day earlier, a 51-year-old Uzbek national was found dead with multiple stab wounds in the same Biryulyovo district where Shcherbakov's death occurred.

Authorities in Baku have yet to comment officially on Zeynalov's detention.

Ethnic tensions were most palpable on social-networking sites, where news of Zeynalov's arrest has unleashed hate-filled exchanges between ethnic Russians and Azerbaijanis.

Zeynalov's purported account on VKontakte, Russia's biggest social-networking site, has gathered almost 900 comments since he was identified as the prime suspect on October 14 -- many of them racist slurs.

"All the blacks in Russia will suffer, so take your compatriots away, you mountain bastard," read a comment, while another user predicts that "Biryulyovo will become a symbol of Russian resistance."

The tone was just as virulent on Azerbaijan's social websites, with many slamming Zeynalov's arrest as disproportionate.

"Police in all authoritarian regimes act in such an ugly and brutal manner," one Facebook user reacted.

Many Internet users in Azerbaijan also voiced concern for the safety of their compatriots in Russia.

Advocacy groups in Russia have warned migrant workers from the Caucasus and Central Asia of a high risk of violence, particularly as Azerbaijanis and other Muslim immigrants celebrate the Islamic holiday of Eid al-Adha.

Police have set up barriers and metal detectors outside Moscow's main mosque.